There is no magic fairy dust protecting Macs - Dai Zovi, security researcher and co-author of The Mac Hacker's Handbook.
After bouncing through various URLs (including one in Russia) you end up at a fake Twitter log in page:
http://wepawet.cs.ucsb.edu/view.php?hash=a9f9677418fa2d11d0b6eddda93e6e3b&t=1338784045&type=js
Note the non-Twitter URL.
